Excersize and Goals

I have just started to get into a routine and am considering joining the "November Excersize" thread to help stay accountable. Here's my question ... I am walking on the treadmill and doing crunches in the fitness center @ my work - I have 103 days free of cigarettes (yayyy me) and have been walking/crunching on my breaks and lunches instead of standing outside smoking. Something like 15minuts/15crunches 3-5 times a day. I feel like doing something is better than doing nothing, and plus I am just starting out. I have never been a regular excersize person. So in closing - Do you think this is a good start, and would I just add all my minutes/crunches at the end of the day for my excersize totals ... Sorry about the ramble ... Thanks everyone